Variable pitch bearing of wind turbine generator, assembly method and wind turbine generator

Abstract

The invention discloses a variable pitch bearing of a wind turbine generator, an assembling method and the wind turbine generator, the variable pitch bearing comprises a bearing inner ring and a rolling body, and the bearing inner ring is directly arranged in a blade mounting hole of a hub in a sleeved mode and connected with a blade. A bearing inner ring annular groove and a hub annular groove which extend in the circumferential direction are formed in the same axial position of the outer side face of the bearing inner ring and the inner side face of an impeller mounting hole of the hub correspondingly, so that the rolling bodies are arranged in a containing space jointly formed by the bearing inner ring annular groove and the hub annular groove. And the hub annular groove is provided with an outer side steel wire raceway of the rolling body. According to the variable pitch bearing, a traditional bearing outer ring is omitted, the hub and the bearing inner ring are directly assembled in a sleeving mode, the production cost can be reduced, the structural rigidity can be improved, and the risk caused by bolt failure can be avoided; the steel wire raceways are arranged on the outer sides of the rolling bodies, so that the problem of insufficient hardness of the hub is solved, installation and maintenance are convenient, and cost can be further saved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a variable pitch bearing of a wind turbine generator set, an assembly method and a wind turbine generator set. Background Art

[0002] The variable pitch bearing of a wind turbine is an important component used to connect the hub and blades of the turbine and realize the variable pitch operation of the turbine. Its basic structure includes an inner ring, an outer ring and rolling elements. The inner ring of the bearing is connected to the blades, and the outer ring of the bearing is connected to the end face of the hub by bolts. Under the load from the blades, the variable pitch bearing needs to withstand a large overturning moment, and both the connecting bolts and the variable pitch bearing have a large risk of failure. How to effectively avoid the risk of failure of the connecting bolts of the outer ring of the variable pitch bearing and improve the bearing capacity of the variable pitch bearing and the overall reliability of the turbine are problems that need to be solved in the current wind power industry. Summary of the invention

[0003] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0004] In order to at least partially solve the above-mentioned problems, according to a first aspect of the present invention, a variable pitch bearing of a wind turbine is provided, comprising a bearing inner ring and rolling elements, wherein the bearing inner ring is directly sleeved in the blade mounting hole of the hub and connected to the blade, and the outer side surface of the bearing inner ring and the inner side surface of the impeller mounting hole of the hub are respectively provided with a bearing inner ring annular groove and a hub annular groove extending in the circumferential direction at the same axial position, so as to arrange the rolling elements in the accommodating space jointly formed by the bearing inner ring annular groove and the hub annular groove, and the hub annular groove is provided with an outer wire raceway of the rolling elements.

[0005] Furthermore, the bearing inner ring annular groove and the hub annular groove are respectively composed of two mutually perpendicular slopes, so that the radial cross-section of the accommodating space is approximately square, and the wire raceway includes two steel wires respectively located at the center positions of the two slopes of the hub annular groove.

[0006] Furthermore, the contact points of the rolling body with the two steel wires and the two slopes of the annular groove of the inner ring of the bearing are distributed at equal intervals along the surface of the rolling body.

[0007] Furthermore, the two slope surfaces of the hub annular groove are respectively provided with two annular grooves extending in the circumferential direction at their respective center positions for arranging the two steel wires.

[0008] Furthermore, the rolling body includes two rows of spherical rollers.

[0009] Furthermore, the variable pitch bearing also includes a sealing piece, the inner ring of the bearing is provided with a rolling element mounting hole extending outward from the inner side surface in a radial direction to the accommodating space, the sealing piece is suitable for being installed in the rolling element mounting hole, the outer end of the sealing piece is provided with a groove structure matching the annular groove of the inner ring of the bearing, the rolling element mounting holes and the sealing piece are equal in number to the rolling elements and their positions correspond one to one.

[0010] Furthermore, the variable pitch bearing also includes a tapered pin, the bearing inner ring is provided with a tapered pin hole which tapers from the blade side end surface to the hub side end surface and is connected to each rolling element mounting hole, and the sealing member is provided with a fixing hole which penetrates radially, so that the tapered pin passes through and abuts against the fixing hole to fix the sealing member.

[0011] The present invention also provides an assembly method of the above-mentioned variable pitch bearing, comprising:

[0012] S1: Place the hub on the workbench, with one of the blade mounting holes facing upward, and install the wire raceway in the hub annular groove;

[0013] S2: placing the inner ring of the bearing into the mounting hole of the blade;

[0014] S3: Install the rolling element into the accommodation space formed by the annular groove of the inner ring of the bearing and the annular groove of the wheel hub, so that the rolling element abuts against the outer wire raceway;

[0015] S4: Install the blades onto the inner ring of the bearing.

[0016] Further, the S3 includes:

[0017] S31: Assembling the rolling element into the accommodation space formed by the annular groove of the inner ring of the bearing and the annular groove of the wheel hub through the rolling element mounting hole;

[0018] S32: Install the plugging piece into the rolling element mounting hole so that the outer end of the plugging piece and the surface of the annular groove of the inner ring of the bearing together form the inner raceway of the rolling element;

[0019] S33: Install the taper pin into the taper pin hole from the blade side of the bearing inner ring.

[0020] The present invention also provides a wind turbine generator set, comprising the above-mentioned variable pitch bearing.

[0021] The variable pitch bearing of the present invention eliminates the outer ring of the bearing in the traditional sense, and the wheel hub is directly assembled with the inner ring of the bearing, which can reduce production costs and improve structural rigidity. Since connecting bolts between the outer ring of the variable pitch bearing and the wheel hub are not used, the risk of bolt failure can be avoided. The use of a wire raceway on the outside of the rolling element solves the problem of insufficient hardness of the wheel hub itself, and it is easy to install and maintain, which can further save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the device and principle of the present invention. In the drawings,

[0023] Figure 1 A cross-sectional schematic diagram of the connection between a pitch bearing, a hub and a blade according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 An enlarged schematic diagram of part A in FIG.

[0025] Figure 3 Schematic cross-sectional view of a blocking member according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0027] In order to fully understand the present invention, a detailed structure will be presented in the following description to illustrate the present invention. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other embodiments and should not be construed as being limited to the embodiments presented here.

[0028] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. The singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. The terms "upper", "lower", "front", "back", "left", "right" and similar expressions used in the present invention are for illustrative purposes only and are not limiting.

[0029] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0030] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings. These drawings show representative embodiments of the present invention and do not limit the present invention.

[0031] The present invention provides a variable pitch bearing for a wind turbine. Figure 1-3 As shown, the variable pitch bearing of the present invention comprises a bearing inner ring 1 and a rolling body 2. The bearing inner ring 1 is directly sleeved in the blade mounting hole of the hub 3 and connected to the blade 4. The outer side surface of the bearing inner ring 1 and the inner side surface of the impeller mounting hole of the hub 3 are respectively provided with a bearing inner ring annular groove and a hub annular groove extending in the circumferential direction at the same axial position, so as to arrange the rolling body 2 in the accommodation space 8 formed by the bearing inner ring annular groove and the hub annular groove. The hub annular groove is provided with an outer steel wire raceway of the rolling body 2. Preferably, the rolling body 2 can include two rows of spherical rollers. The variable pitch bearing of the present invention omits the bearing outer ring in the traditional sense, and the integrally cast hub is directly sleeved and assembled with the bearing inner ring, which can reduce the production cost and improve the structural rigidity; and since the connecting bolts between the variable pitch bearing outer ring and the hub are not used, the risk of bolt failure can be avoided. In addition, since the material of the hub is mostly ductile iron, in order to meet the hardness requirements of the bearing raceway, a steel wire raceway is provided on the surface of the hub annular groove as the outer raceway of the rolling body, which is convenient for installation and maintenance.

[0032] According to an embodiment of the present invention, the annular groove of the inner ring of the bearing and the annular groove of the wheel hub are respectively composed of two slopes perpendicular to each other, so that the radial cross-section of the accommodating space 8 is approximately square, and the wire raceway includes two steel wires 5 located at the center positions of the two slopes of the annular groove of the wheel hub. Preferably, the two slopes of the annular groove of the wheel hub are respectively provided with two annular grooves extending in the circumferential direction at their respective center positions for arranging the two steel wires 5. The contact points of the rolling body 2 with the two steel wires 5 and the two slopes of the annular groove of the inner ring of the bearing are equally spaced at an angular distance of 90° along the surface of the rolling body 2, thereby forming a four-point support raceway evenly distributed on the rolling body 2 to achieve balanced force on the rolling body.

[0033] According to an embodiment of the present invention, the pitch bearing further includes a plugging member 6, the bearing inner ring 1 is provided with a rolling element mounting hole extending outward from the inner side surface in the radial direction to the accommodating space 8, the plugging member 6 is suitable for being installed in the rolling element mounting hole, the outer end of the plugging member 6 is provided with a groove structure matching the annular groove of the bearing inner ring, and the number of the rolling element mounting holes and the plugging member 5 is equal to the number of the rolling element 2 and the positions correspond one to one. In order to meet the hardness requirements of the bearing raceway, at least the outer end portion of the plugging member 6 is made of the same steel material as the bearing inner ring 1. Further, the pitch bearing further includes a taper pin, the bearing inner ring 1 is provided with a taper pin hole 7 which tapers from the blade side end surface to the hub side end surface and is connected to each rolling element mounting hole, and the plugging member 6 is provided with a fixing hole 9 which penetrates in the radial direction, so that the taper pin penetrates and abuts the fixing hole 9 to fix the plugging member 6. Preferably, the taper pin hole 7 penetrates along the axial direction of the bearing inner ring 1, so as to facilitate the disassembly and assembly of the taper pin for maintenance of the rolling element.

[0034] The present invention also provides an assembly method of the above-mentioned variable pitch bearing, comprising the following steps:

[0035] S1: Place the hub 3 on the workbench, make one of the blade mounting holes face upward, and install the wire raceway in the hub annular groove;

[0036] S2: Place the bearing inner ring 1 into the blade mounting hole;

[0037] S3: Install the rolling element 2 into the accommodation space 8 formed by the annular groove of the inner ring of the bearing and the annular groove of the hub, so that the rolling element 2 abuts against the outer wire raceway;

[0038] S4: Install the blade 4 to the bearing inner ring 1.

[0039] Specifically, in the above step S2, the bearing inner ring 1 can be hoisted to the final installation position in the blade mounting hole of the hub 3 and kept suspended, and then step S3 is implemented. For the convenience of operation, the blade side end face of the bearing inner ring 1 in the final installation position is set to be flush with the outer end face of the blade mounting hole of the hub 3, so as to facilitate accurate positioning during the installation process; preferably, a positioning boss is provided in the blade mounting hole of the hub 3, which is used to abut the hub side end face of the bearing inner ring 1 when the bearing inner ring 1 is in the final installation position.

[0040] Furthermore, the above step S3 may include:

[0041] S31: Assemble the rolling element 2 into the accommodation space 8 formed by the annular groove of the bearing inner ring and the annular groove of the wheel hub through the rolling element mounting hole;

[0042] S32: Install the blocking member 6 into the rolling element mounting hole so that the outer end of the blocking member 5 and the surface of the annular groove of the inner ring of the bearing together form the inner raceway of the rolling element 2;

[0043] S33: Install the tapered pin into the tapered pin hole 7 from the blade side of the bearing inner ring 1.

[0044] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "parts" and "pieces" appearing in this article may represent either a single part or a combination of multiple parts. Terms such as "installation" and "setting" appearing in this article may represent either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0045] The present invention has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A variable pitch bearing for a wind turbine, characterized in that: The invention comprises a bearing inner ring (1) and a rolling body (2), wherein the bearing inner ring (1) is directly sleeved in the blade mounting hole of the wheel hub (3) and connected to the blade (4), and the outer side surface of the bearing inner ring (1) and the inner side surface of the impeller mounting hole of the wheel hub (3) are respectively provided with a bearing inner ring annular groove and a wheel hub annular groove extending in the circumferential direction at the same axial position, so as to arrange the rolling body (2) in the accommodating space (8) formed by the bearing inner ring annular groove and the wheel hub annular groove, and the wheel hub annular groove is provided with an outer wire raceway of the rolling body (2).

2. The pitch bearing according to claim 1, characterized in that: The bearing inner ring annular groove and the wheel hub annular groove are respectively formed by two mutually perpendicular slopes, so that the radial cross-section of the accommodating space (8) is approximately square, and the wire raceway includes two steel wires (5) respectively located at the center positions of the two slopes of the wheel hub annular groove.

3. The pitch bearing according to claim 2, characterized in that: The contact points between the rolling body (2) and the two steel wires (5) and the two slope surfaces of the annular groove of the inner ring of the bearing are distributed at equal intervals along the surface of the rolling body (2).

4. The pitch bearing according to claim 2, characterized in that: The two slope surfaces of the hub annular groove are respectively provided with two annular grooves extending in the circumferential direction at their respective center positions for arranging the two steel wires (5).

5. The pitch bearing according to claim 1, characterized in that: The rolling body (2) comprises two rows of spherical rollers.

6. The pitch bearing according to any one of claims 1 to 5, characterized in that: The variable pitch bearing further comprises a sealing member (6); the bearing inner ring (1) is provided with a rolling element mounting hole extending outwardly from the inner side surface in a radial direction to the accommodating space (8); the sealing member (6) is suitable for being installed in the rolling element mounting hole; the outer end of the sealing member (6) is provided with a groove structure matching the annular groove of the bearing inner ring; the rolling element mounting holes and the sealing member (5) are equal in number to the rolling elements (2) and their positions correspond one to one.

7. The pitch bearing according to claim 6, characterized in that: The variable pitch bearing further comprises a tapered pin, the bearing inner ring (1) is provided with a tapered pin hole (7) which tapers from the blade side end surface to the hub side end surface and is connected to each rolling element mounting hole, and the blocking member (6) is provided with a fixing hole (9) which penetrates in the radial direction, so that the tapered pin penetrates and abuts against the fixing hole (9) to fix the blocking member (6).

8. An assembly method for a pitch bearing according to any one of claims 1 to 7, characterized in that: include: S1: Place the hub (3) on a workbench, with one of the blade mounting holes facing upward, and install the wire raceway in the hub annular groove; S2: Sleeve the bearing inner ring (1) into the blade mounting hole; S3: installing the rolling element (2) into the accommodation space (8) formed by the annular groove of the inner ring of the bearing and the annular groove of the wheel hub, so that the rolling element (2) abuts against the outer wire raceway; S4: Install the blade (4) onto the bearing inner ring (1).

9. The method for assembling a pitch bearing according to claim 8, characterized in that: The S3 includes: S31: assembling the rolling element (2) into the accommodation space (8) formed by the annular groove of the bearing inner ring and the annular groove of the wheel hub through the rolling element mounting hole; S32: Install the plugging member (6) into the rolling element mounting hole so that the outer end of the plugging member (5) and the surface of the annular groove of the inner ring of the bearing together form the inner raceway of the rolling element (2); S33: Install the taper pin into the taper pin hole (7) from the blade side of the bearing inner ring (1).

10. A wind turbine generator set, characterized in that: The wind turbine generator set comprises a pitch bearing and a hub as described in any one of claims 1 to 7.

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